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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c305f0760200b5c398dfa903c2b66ae203055b22523e94dd76eb65881df31b0' 
  AND token = 'sphHW6cpgT9e+cySYYDqeO90vt3fCaox+UW30aKlF5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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