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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a920a61d51016316da9a2b7f7e23a6a01c66c93534af267a83794a83549eb56' 
  AND token = '646vbtxzjyTrRLmgXl2zg+UgP9UOWsoZzduu3oqm70o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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