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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d9ee67687e64fd5ab3413c96ac701acd673b36a9a70027ab8eb0575ba059ac' 
  AND token = 'DRIQsnIA8NMdpXf4or8zOk8mvK0CGeFGjCctT3ZTSQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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