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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d50c8f5f0ca4a22d2890dd026cfad8f03e086beb01bedcc58ddee2a0bef46f7' 
  AND token = 'STJEgo3372OMFpyuoPpaHFB8Ulr8ykO7DpVcgNNHMPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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