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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff382c54fd10e6ad211e18d4b956b76425ae820238a9e1ef46e95cab96a120' 
  AND token = '1oTMtXn50n2xzOm+wFuGKhcpmd+CvbbGeazBevrHiYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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