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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e046cceaf92e5a3b348db3c8de9fca8fd384f94bd83bb16a1b20b3647f0a8b22' 
  AND token = 'JkeYYxKBOExJSSJyHSKuL2XwFN2KCf1UMwqtSOigzTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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