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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cd088b0f499d9f821959277c512a16372e36d6e760a59ccd438d520c99bb13' 
  AND token = 'oVOea8yXdTNQ+blo2Y9/Gh82KxgId+Nc6vJG8V254aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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