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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c529e65629f131821e5ed9a8f68b66ead6f14d70ea85d1cd95a4b00cfa5b3dc4' 
  AND token = '45Qxyu4F4Y8BOgPSgRCN5+PpvU5FQtE9w3J2FZIJu9c=' 
  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"
    }
  }
}