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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e3e475a49a6151bfb45676be8f6365dcc7ac10459bea40f70df471c36b664e' 
  AND token = 'OaLK2IkVIsV3NgC9tt7/7R5HYag3jyvniTNtDpNa4Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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