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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce1fdb819b3cd20f733ecad9628e2443276ecb2c25f4d98467c9abc9776c648' 
  AND token = 's9WvlxpNldY3aZ1B9KwB3SHMskXvJcmiW9GbXsZLXlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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