SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1af26d11b26eb329c3de0bb352a87f1ee85b1e7139d7c8673940729d54745b5' 
  AND token = '0XfpqBiwIj2ayXbg/KnCwPqQXjvemvuhZVSMoT2jpHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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