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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cd9bda6ba46c71abc12c234c44e6e2dbd687145865e8f3f5996aba21cb09ae' 
  AND token = '4HhUFkvUFdLvhAkq3FQiuS9BpZCQfuSt0asaFK6dY9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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