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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f3ab800428dc7ce6e8da2cb3565a02a8586b6575d7b4aa3daac3a3726074f8' 
  AND token = 'a+h8eSs+OfG79CyGGI86eZywsbkC5SGP4i8oeO7+s7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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