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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d950c3502765cc4addc65edf05c4b88f1e1c1ad18cf499d032a6d1171b81523' 
  AND token = 'yZglHHjEY7IA9707T9aJ6FeBMSeKIYpe950sRc4dCI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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