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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd581e7ba776bcfa9ff78881b76d7e6c13a0a58cb8a42e4651c1ebf4409d3991' 
  AND token = 'q/xNAkrxTI4Poj/JDy3URntM1YWFvlNlhR/5/CWrBIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}