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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cab9227d2e5ebaa1503fed982c44e81a04e3f955da6b1146bc5c2c19dc016f' 
  AND token = '+XxpNdPnFWm89dtNlKD/0h8dKSgsrZPT0Yu+j9jayuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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