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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c533149d66b977614476d726d132e7ffe2a3ba1dd99dd034aeac63a4bf15fcb9' 
  AND token = 'YTZW12X7QZkZ2/tWz/exoKWDFcgnU1bdEqLJoz/y+bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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