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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fe356bbf46d9085a5a8061a5e4d8af617638404b4d3594d9ab6a951d6ecadd' 
  AND token = 'G0bvnUMw4s+AZFpP3yNyc4977a/khmSxQukUne/12xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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