SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3027900844d4d2dbab58301db5954b417f706dabeac6e495ee75aa882ea602a' 
  AND token = 'oMJ84bi/JC2tLcN6vtLZEl+zom4oJOVvdamvE0PRlAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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