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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35a8883b2a86bb42e6359c02f8387e370231ee79f611d9583e6a9c389abe2af' 
  AND token = '5C7UgBgyrAtRPaG20im79eZJNnUQz7GsqFAgaLV9uP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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