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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fee8e87b32994ade54522ab387126af44e8afe1fcbb48d1759e74bced82d9b' 
  AND token = '1p2mZXIyWRJUKjFs1FuoVs3eGK9k8hOqZKhKR3o2EEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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