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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95eefd6bceb5fa1054091468a378ad5a12cc71670162021662d461a21cad5eb' 
  AND token = '94X8XjTzPRksI2jtvKomFgfsHYzHO7mpQJBdxT5HXyE=' 
  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"
    }
  }
}