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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcbd1c20045d5c334488f071254e582fe6d84ea0448d9c8cce89a575a49c096' 
  AND token = 'eAx3/Vs23UldcvsuI9DBRDhAG5tv7w5nL/hDwabc/Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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