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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a930770c0b4752ec3146298957fe08190b50486b5e0a783d0a12ff7f095ccd9' 
  AND token = 't2K1jCVvEteBUn70Kz66muMFq0ksThTGdfKqNyxvjqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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