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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a458fd4e31869a9aa7fa7908b3e62f93ec10f4c2db8842dfd1027fa99796c201' 
  AND token = 'uoJw4LFV2dyrhWewCmyp2Oyp3VeiatqDq9Ym2K8RrHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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