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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289818a12b45fdefbaabc28f50af31159572687fb1bc71f22a8afcaf241fd4bc' 
  AND token = 'qnpw6EhbLWTlpHrm7w8tsGcZNX7BFnirwpDrI9Ke+tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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