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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f272029c36b769e9447fdcf11270dc59933d0181d8666659c09ec83212ed4140' 
  AND token = 'meKDXshoRC9yt5kU2C7juH8wW4HQ37ANkzqYgirou70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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