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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d2af282a93939ad161222c9609230144b145ae720cdfcb2df0a2719b090872' 
  AND token = 'D9p3EjvHUvvcEDNK8f+/O5lociI25On+R42ELi+XpUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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