SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75269985523279563dd2ecd94ad08a2037e4c3529eb49a2aeb8afdc8641279c5' 
  AND token = 'nCNqVialsmDyJ+E9GkSjFS/UBsQ0V0wSINALeqplfug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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