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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6a311510f283c1c64eb329084ca8ba837b76df62d34698109a6296443d2903' 
  AND token = 'bji/E0WK9looGFesJbhbrfK8f67FXyGt/MxAAhjE1Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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