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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a8af4af96142ccb155ff27785e9c48797bacc343e086a01519a2f43f60f908' 
  AND token = 'cebilaYnwAUVCM89eeJQSaC/yGPS3rrsZyKmcpek/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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