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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8643ce7f7c7fe6ec438327da949ec1f5e13895ead3999a33c36830e64005d8dd' 
  AND token = 'zZCw/GFx9WW2gZM5dgxECGvdcP4Yo7Y9DKJbZ1djPJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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