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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904f8347365241304e782d36b033f540f78082f07d957ba787ea543a3f51d8da' 
  AND token = 'b7As2s007z6Fq4D4vkQqoGoOvQcgHwtOi22uXUE0fU8=' 
  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"
    }
  }
}