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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727e08ea7f000d24be5194d3a8105a9ee872506f623426d483581a7ba6956d07' 
  AND token = '1tr+CasAMSwa9a5ylfNZs/SLP5iaEqhEqiAnUDRGyO4=' 
  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"
    }
  }
}