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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd703b3e007e314c32f176bb84c78e5a8dd5fc35d0fb43acfc7e0a02c47de242a' 
  AND token = 'y5q0lNUwlgUXLE1edMfqP3iR7ohJ3vGo/Pszpd2kFaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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