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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f531e77a0c3d8a15c901bceeb47a1465e8e9d69ba36ad0bc1c02aa668842fe' 
  AND token = '6/NMYRR6/vcaEdy2o2Ui+b1wMH2vURG4nFh5pZ/8LS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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