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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5853ac2b86ff1e1f5bdf6c6f1af1a6d6fc1fa87bf85e698a824411566a5784' 
  AND token = 'dVZqzxP4EpLfdxessFNNCqIugsl8PQ5ZYBsKq3hlP3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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