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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ef2ea78ea2d6316aaa824cde2e7ee68bef999fc56e1c38af9ce0e08b2e5456' 
  AND token = 'UdjSiLGHRgMByxnpU/UtKnQeIQh9Qmkh2s/1MwVaY/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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