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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec99e4be1897fb751def6e77ff7cc7f8a700aebaa014201c26199499ce0053ce' 
  AND token = 'KSpVhAJTaAWB58WuPmcSpv/S4nyvbN2Vf7jRS++SJaQ=' 
  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"
    }
  }
}