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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43dd26237d790a0b7334b124404ea2b6ad7e42681c2a28d1755e0b0ee27a5a9' 
  AND token = 'sxbBuko4Bcf1+7wmPrjJ+5WXaqVa4JBzSMSoEQ9UPpU=' 
  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"
    }
  }
}