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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b66e83e48e2d849ca007b2c4ba2f6abc22fc12896cef8b6639b76c2a1be4c9' 
  AND token = 'FJ9rNNpPwFtVvFDD3V0BE+JSsMOCEOf+n7g612yy5uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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