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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a91c0bf36d60d6a24fe0964e0b39189ec5e814f3c76ca84ba3ceb688217ba3e' 
  AND token = 'Pi9/0OZW29WUnr8V1QL0+sFDlEe581Xyf0/aeXIoKrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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