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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241ebee1ca058c9bbd9d18a10c4d92391fd10d19172c1c4e50f3dc68ef832b25' 
  AND token = 'cy2r9LDwsnQnONTUuI/mM58iiV7pYMWQgN3bcaIwXw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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