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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10d55d749ebf0b3dcf0596e0ee4ed48051a9b285eab21366bd72881b7473357' 
  AND token = '1DeQjxJaC87E6iwKUPCvC0JWdwKsXsteQlD0YMcHqww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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