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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c76caabe19db10bbf0007226e8ce24c2cc46addc29308b048d2ac4706816bb' 
  AND token = 'dQUZ2Adz1M0RV1p9r2x3upm9uj5U/NGYZ1o3CDvos9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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