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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87500b34de922ac807e203c69d28aa59b6cda461ad909cedf49d53c590411c1' 
  AND token = 'aLITOLj363PgkOjmMZlXQDt6L+9CpBaXABP4Pg7w8Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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