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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39a6ec9e1f1e53d045abb2ef2d4a3109ef26cb236fa6d694a491cd68c56f152' 
  AND token = 'EdODV694epHYU8aD9B9XEUxqtqDkEDK51u6KQ5auJC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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