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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304f377f26efa7573adb97801c9a2bb4b0fdb23221f7a56e9f8e8ce4230bcfe0' 
  AND token = 'T7JNLtv9Ji7pDkFV0bLyJvixNW7m1eHqpYrK4Tv0x4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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