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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36ac4d01949085d8c0bce8b8616fa6e6946198a2097a5cb2aba4230f8a4bb49' 
  AND token = '0DtkFiDbBG9jtSPVlacc7ok8aUNzq/FTs/bWBVVXEDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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