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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd219a8e8b143a25046c495f2c8f7d7a2de72bf3f6dd2bcbf1dab6b7227c3544d' 
  AND token = '3eDAN6psuoaR+etrlA+x2cfwBIuYuZ45UQ17sU1mFwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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