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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a044a0badd368721b12080fa7c3aa3fd3483ff210a107fb772a92b83d4d65319' 
  AND token = '24+oJnhIFRLi41e4BmA8yuiteFRpQWrQreOvJ4/stDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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