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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28dcdaffde94a80a1bdba4d99199502c19657f439f1bdd1c0ab8f783f0a589f0' 
  AND token = 'C3be4glTTwA+utTb3G2l3l6MwpZdJwRR1pF0lWZMKHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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