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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251b8d15f919a29fbebe209cbfa32f61c84b312bebb7b3a5cc9b697455135701' 
  AND token = 'uOVgHa24RbEe4VIwMwLbVpphohPbiIHPg7QUlFFxdOY=' 
  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"
    }
  }
}