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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35131d9ef2382b95dd2098bb9bc04ad8deb196c60aacdb6ba7c640d2c3dc558e' 
  AND token = 'HUx7OVnxqI0vHWXgeHZfFXcB2eMrJvrJQnb5Bw7UlAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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