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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20901db4065dcda3155935daf5ae6de0d951d336fd3671a96aa5c3b9d531c7ff' 
  AND token = '7BhUUn+FQQ7FoQs/iXP7GoSXoGSnr5+mRtuJxx7ESHs=' 
  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"
    }
  }
}