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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a87cf4bfe08732cb41fd5776774518a6ae220513c3857d5d39425a0efc723a' 
  AND token = 'f22xBSV0hT/JBVAcB51iO6MX0+05VtMKfUVBxaL6SQk=' 
  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"
    }
  }
}